<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
  </head>
  <body>
    <button id="btn">按钮</button>
    <div id="app"></div>
    <script type="text/babel">
      const oBtn = document.getElementById("btn");

      //创建一个原始虚拟DOM
      const vDom = (
        <div>
          <div>
            天气预报
            <p>hello</p>
          </div>
          <p>
            今日小雨 <span>world</span>
          </p>
        </div>
      );

      //创建一个根容器
      const root = ReactDOM.createRoot(document.getElementById("app"));
      //把原始的虚拟DOM渲染在根容器中
      oBtn.onclick = function () {
        const vDom = (
          <div>
            <div>
              天气预报
              <p>hello</p>
            </div>
            {/* <p>今日小雨</p>*/}
            <p>
              今日小雨
              <em>world</em>
            </p>
          </div>
        );
        root.render(vDom);
      };
      root.render(vDom);
    </script>
  </body>
</html>
